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Trump vs. American public on climate change

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Americans overwhelmingly agree with the scientists, according to public opinion polls

What they don't agree on, at all, is how big a deal it is

Washington (CNN)Scientists overwhelmingly agree that the climate is changing and getting warmer, and that humans are contributing.

Americans overwhelmingly agree with the scientists, according to public opinion polls.

Seventy percent say climate change is happening, according to a study from researchers on climate communications at Yale and George Mason universities in January, and 55% said it is mostly caused by humans.

They have also supported US adherence to the Paris Accord -- 70% -- the enormous, nearly worldwide international agreement that countries must act to keep global temperatures at bay.

President Donald Trump is said to be on the verge of pulling out of that agreement.

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Trump has said often climate change isn't real

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That 45% who worry a great deal is up quite a bit from just two years ago, when it was just 37% who said they "worry a great deal." Back in 2011, it was a mere 25%.

So it's true to say less than half of Americans are worried a great deal about climate change, but the number is growing at a very fast clip.

As Jennifer Agiesta, CNN's polling director, puts it:

"It's possible this could be one of those issues where concern is connected to who's in charge of the policy. Trump came into office very clear about his intention not to do much to stop warming, so people who were fine with what Barack Obama's administration was doing about it (and therefore not that concerned during the Obama years) might be expressing greater concern now that the presidency has changed hands."

She said it's possible climate could become an issue that ebbs and flows in public opinion like the economy, which is often directly tied to the White House. Democrats are more bullish during Democratic administrations, and vice-versa. But that will be born out in future if concern about climate change continues to grow and becomes more or less bipartisan.